[ in-sol-yuh-buhl ]
See synonyms for insoluble on
  1. incapable of being dissolved: insoluble salts.

  2. incapable of being solved or explained: an insoluble problem.

Origin of insoluble

1350–1400; <Latin insolūbilis; replacing Middle English insolible<Middle French insoluble< L. See in-3, soluble

Other words from insoluble

  • in·sol·u·bil·i·ty, in·sol·u·ble·ness, noun
  • in·sol·u·bly, adverb
  • sem·i-in·sol·u·ble, adjective

Words that may be confused with insoluble

Words Nearby insoluble Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use insoluble in a sentence

British Dictionary definitions for insoluble


/ (ɪnˈsɒljʊbəl) /

  1. incapable of being dissolved; incapable of forming a solution, esp in water

  2. incapable of being solved

Derived forms of insoluble

  • insolubility or insolubleness, noun
  • insolubly, adverb

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for insoluble


[ ĭn-sŏlyə-bəl ]

  1. Not capable of being fully dissolved. Fats and oils are insoluble in water.

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.